360 running hot…very hot

I used a similar shroud for a week. It did nothing for me. Same issue when I had my 318. Fine on the highway, hot in traffic.
Aluminum 26" radiator helped, proper timing made it the best. It still crept up at idle and in traffic, but never over about 215.
Weird part was that even with the temp gauge over 200, ir temp reading at the thermostat was never over 195.